<!DOCTYPE html>
<html >
  <head>
    <meta charset="UTF-8">
    <title>Vue Demo</title>
  </head>
  <body>
    <div id="app">
      <div>{{ counter }}</div>
      <button v-on:click="increment">Increment</button>
    </div>
    <script src="vue.min.js"></script>
    <script src="app3.js"></script>
  </body>
</html>
